Federal Judge: Warrantless Flock Plate Search Violated Fourth Amendment

A federal judge in Oklahoma ruled that a Tulsa County sheriff's deputy violated a woman's Fourth Amendment protections by searching her license plate data through Flock without a warrant, calling the practice "indiscriminate mass surveillance".

The Ruling

U.S. District Judge Sara E. Hill issued the decision on October 1, 2026, finding that the deputy conducted an "unconstitutional warrantless search" by using Flock's license-plate-reader system to reconstruct the woman's travels before identifying any traffic violation or criminal activity. The search produced more than 50 sightings of the vehicle across several states over roughly a month.

The judge ordered that evidence obtained through the surveillance be suppressed.

Judge Hill's Reasoning

In her ruling, Judge Hill emphasized the constitutional distinction between being seen in public and having one's movements catalogued over time:

"Freedom from persistent, dragnet-style surveillance while in public is not a foreign concept in our society, and it is a reasonable expectation that society already accepts".

"But it becomes constitutionally problematic when law enforcement can indiscriminately and passively catalog your whereabouts over an extended period of time and then use that information for any purpose whenever convenient".

She described the practice as "a type of indiscriminate mass surveillance".

Case Background

The case involved Melisa Kyle, who was arrested by Oklahoma officials for possession of methamphetamine with intent to distribute. The deputy, who worked for the Drug Enforcement Administration, initially stated she was pulled over for suspicious driving, but it was later revealed that he had run her license plate through the county's Flock database and used the location data as sufficient cause to stop and detain her.

Significance

The ruling is notable because it breaks with prior judicial treatment of ALPR technology. Other judges have likened Flock cameras to other police surveillance methods and noted that drivers have no reasonable expectation of privacy on public roads. Judge Hill, however, found that Flock's nationwide database puts it in a different category, giving officers access to a vast trove of data that can be searched without a warrant on theoretically anyone traveling across state lines.

The decision does not constitute a nationwide ban on ALPR technology nor does it establish binding precedent for all U.S. jurisdictions. Its immediate effect is limited to the specific case in Oklahoma.

Flock Safety has responded to the ruling by stating that the decision conflicts with other legal precedents and expressing an expectation that the matter will be appealed.